DuraVent FasNSeal W2 12" 45 Degree 29-4C Stainless Steel Double Wall Elbow watt1220 It may be built into

It may be built into the wall

Finish: Nextrema Schott glass

What is the difference between

18' Control Wire

Variable heat with Thermostat (50 to 90 °F)

DuraVent FasNSeal W2 12" 45 Degree 29-4C Stainless Steel Double Wall Elbow watt1220 It may be built intoFasNSeal W2 (double wall) vent lengths and components feature patented built in mechanical locking band and triple lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90 from mechanical locking bands. This construction feature allows for ease of installation. The air space between the inner and outer wall on FasNSeal W2 helps to reduce the clearance to combustibles in addition to creating a heat shield